I HAVE A NEW 24ft x40ft SHOP/GARAGE THAT I AM BUILDING WE USED ENGINEERED I-JOIST 16X24 THAT ARE 19.2in ON CENTER WITH 3/4 STURDI FLOOR TOUNG & GRUVE PLY FOR SUB FLOOR PL 400 GLUED & SCREWED . THE THICKNESS IM AM TOLD SHOULD HAVE BEEN AT LEAST 1 1/4 AND TO PUT ANOTHER LAYER OF 3/4 OVER IT . ...
